Lux, Jim (337C) wrote:
-----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf
Of Bob Camp
Sent: Wednesday, February 17, 2010 1:57 PM
To: 'Discussion of precise time and frequency measurement'
Subject: Re: [time-nuts] DMTD to MMTD
Hi
Thanks for the quick response.
The impression I've always had of that system is that it is comparing the
sources two at a time. They can select between a number of sources, but only
one pair is looked at.
It basically timestamps transitions on all 8 inputs. The post processing
software that looks a the timestamps is what selects either 1 channel (single
mixer+offset generator) or 2 channels (dual mixer time difference)
The counters in the FPGA are running at 100 MHz, so they have a basic
resolution of 10 ns.
_______________________________________________
See:
http://tycho.usno.navy.mil/ptti/ptti2006/paper11.pdf
Bruce
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